41Ca ultratrace determination with isotopic selectivity > 1012 by diode-laser-based RIMS

被引:46
作者
Müller, P
Bushaw, BA
Blaum, K
Diel, S
Geppert, C
Nähler, A
Trautmann, N
Nörtershäuser, W
Wendt, K [1 ]
机构
[1] Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[2] Univ Mainz, Inst Kernchem, D-55099 Mainz, Germany
[3] Pacific NW Natl Lab, Richland, WA 99352 USA
关键词
D O I
10.1007/s002160100815
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Ca-41 ultratrace determination by diode-laser-based resonance ionization mass spectrometry with extremely high isotopic selectivity is presented. Application to environmental dosimetry of nuclear reactor components, to cosmochemical investigations of production cross sections, and biomedical isotope-tracer studies of human calcium kinetics are discussed. Future investigations are possible use in Ca-41-radiodating. Depending on the application, Ca-41 isotopic abundances in the range of 10(-9) to 10(-15) relative to the dominant stable isotope Ca-40 must be determined. Either double- or triple-resonance optical excitation with narrow-band extended cavity diode lasers and subsequent non-resonant photoionization of calcium in a collimated atomic beam were used. The resulting photoions are detected with a quadrupole mass spectrometer optimized for background reduction and neighboring mass suppression. Applying the full triple-resonance scheme provides a selectivity of similar to 5 x 10(12) in the suppression of neighboring isotopes and > 10(8) for isobars, together with an overall detection efficiency of similar to 5 x 10(-5). Measurements on a variety of sample types are discussed; the accuracy and reproducibility of the resulting Ca-41/Ca-40 isotope ratios was better than 5%.
引用
收藏
页码:508 / 512
页数:5
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